As a classical result of Fox and Milnor [1]}, if \(K\)  is slice, then the ordinary Alexander polynomial can be written as
\(f(t)f(t^{-1})\)  for some \(f\) . Generalized to TAP, more slice obstructions of such kind were obtained. Kirk and Livingston [2]}
showed that some knots (e.g. \(8_{17}\) ) are not concordant to their inverses. Herald, Kirk and Livingston [3]} showed that 16
of the knots with no more than 12 crossings are not slice; this could not be done before.
